great progress it has made since Hong Kong returned to China in 1997.A. WhichB. WhatC. Ho

问题补充：

great progress it has made since Hong Kong returned to China in 1997.

A. Which

B. What

C. How

D. Whether

答案：

A. Which

(答案→)B. What

C. How

D. Whether

解析：选B。考查感叹句。句意: 自从香港1997年回归中国以来它取得的进步多么大啊!设空处修饰的中心词是名词, 故用what。